Certain Financial Statement Information Property and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2014		Dec. 31, 2014		Mar. 31, 2014
Schedule of Property and equipment
Machinery and equipment	$ 39,520,000		39,520,000		$ 44,503,000
Leasehold improvements	10,473,000		10,473,000		11,574,000
Computers, office furniture and equipment	44,581,000	[1]	44,581,000	[1]	43,365,000	[1]
Property and equipment, gross	94,574,000		94,574,000		99,442,000
Less: accumulated depreciation and amortization	(73,628,000)	[1]	(73,628,000)	[1]	(78,696,000)	[1]
Property and equipment, net	20,946,000		20,946,000		20,746,000
Fully depreciated assets written off	$ 11,800,000
Machinery and Equipment [Member] | Minimum
Schedule of Property and equipment
Useful life			3 years
Machinery and Equipment [Member] | Maximum
Schedule of Property and equipment
Useful life			5 years
Leasehold Improvements [Member] | Minimum
Schedule of Property and equipment
Useful life			1 year
Leasehold Improvements [Member] | Maximum
Schedule of Property and equipment
Useful life			5 years
Computers, Office Furniture and Equipment [Member] | Minimum
Schedule of Property and equipment
Useful life			3 years
Computers, Office Furniture and Equipment [Member] | Maximum
Schedule of Property and equipment
Useful life			5 years

[1] During the three months ended December 31, 2014, the Company wrote off fully depreciated assets with an acquired cost of $11.8 million.